County



S. F'AHRNEY.

' VISE. v

PATENTED JUNE 3, 1856.

' UNITED STATES PATENT UFFICE.

SAMUEL FAHRNEY, OF BOONSBORO, MARYLAND, ASSIGNOR 'I'O ABRAHAM HUFFER AND BENJ. FAHRNEY, OF WASHINGTON COUNTY, MARYLAND.

VISE.

Fig. 2, is a in causing the moving jaw of the vise to retain its parallel position to the other jaw which remains stationary at any distance that it is required to be moved, and by the means herein described. In using the vise this becomes necessary for various reasons. One is the shoulder of the head of the screw which works against the movable jaw is always at right-angles to the face of the stationary jaw and when the movable jaw changes its parallel position the shoulder will work against only a small portion of the jaw which it covers and consequently will when drawn tight against the jaw in this condition cut, bruise or mark the jaw and soon ruin it. And if it is desired to clamp pieces of planks, scantling or other sawed timber the sides of which are parallel it is necessary that the jaws should move parallel with each other at all times, otherwise one or the other edges of such pieces of timber will invariably be injured which would not be the case if the jaws were retained in their parallel position as described, and further in the common use when it is necessary to change the vise, when set for a thin piece of wood, for a thick piece it is always necessary to take out the pin in the bottom and change it, which is very inconvenient. Now by my improvement all these difficulties are obviate as be seen.

To enable any one skilled in the manufacture to make said improvement I will proceed to describe it by letters of reference the same letters referring to the same part in the difierent figures in the drawings.

A, is the stationary jaw and B, the movable one.

C, is the screw and is made in the usual manner as also the jaws A, and B, except that they have no mortise nor pin slot in their lower ends.

D, D, are sections of circles having cogs on their circular parts which mesh into each other. Now at the center of the circles of which they are a part these two sectors are pivoted in the A, at a, and 5, these sectors being exactly alike.

E, represents both suflioiently. Now the points a, and Z), are just distant apart the diameter of the circle of which these circles are apart, 2'. e. from pitch line to pitch line. Consequently when the one is moved it moves the other in the same direction in relation to the face of the jaw A, and the arms F F, which extend in partially in opposite direction from the center from that in which the sectors extend have their opposite ends working in eyes H, H, and said arms F, F, being one up and the other down are both turned in the same direction in relation to the face of the jaw in which they are pivoted, and the eyes H, H, are in this case a part of the studs in jaw B, but when great space is required between the jaws these eyes should be connected to the studs G, G, by a flexible joint as at I. The studs G, G, being secured in jaws B, at the points 0, and d, and the ends of arms F, F, working in eyes H, H, and the cogs on D, D, meshing into each other it will be seen that when the screw 0, is turned in that direction which will cause the jaws to open the stud at 0, will move with the top of jaw B, as it is moved by the screw G and it by the eye on its end will act on the arm F which passes through said eye and said arm will act through the cogs on its sector on the sector pivoted at b, which will act through its arm on the stud secured at d, and cause that end of the jaw B, to move just as much as the screw C, moves the other end. And on reversing the screw C, the reverse will be the case. Now it will be seen that there is an iron key passing through the jaw B, just above the screw C, having its lower edge working in a groove in the barrel of the screw C, which causes the jaw erated as described for the purpose of ren- B, to open as the screw is Withdrawn. dering the jaws of the vise parallel to each Having thus described my improvement other. what I claim as new and desire to secure SAM. FARHNEY. 5 by Letters Patentis, Witnesses:

The use of the sectors D D in combina- ELIAS ONEAL,

'tion with the studs G constructed and 0p- MILTON S. STEPHENS. 

